Valerio, Luca, De centro gravitatis solidorvm libri tres
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              catarum quadrata eſſe inter ſe in eadem proportione; erunt
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              prædictæ inter ſectionem parabolam, & baſim interiectæ
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              inter ſe longitudine, vt in ellipſe ad diametrum ſimiliter
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              vt diximus applicatæ inter ſe potentia. </s>
              <s>Manifeſtum eſt
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              igitur propoſitum. </s>
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              PROPOSITIO V.
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              <s>Omnis figuræ circa axim in alteram partem
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              deficientis, cuius ſuperficies, excepta baſe ſit to­
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              ta interius concaua baſim habentis circulum, vel
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              ellipſim; quælibet tres ſectiones baſi parallelæ
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              æqualia axis ſegmenta intercipientes, ita ſe ha­
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              bent, vt minor ſit proportio minimæ ad mediam,
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              quam mediæ ad maximam. </s>
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              <s>Sit figura ABC circa axem BD in alteram partem de­
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              ficiens, qualem diximus: & poſitis in axe BD tribus qui­
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              buslibet punctis
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              F, E, L, æqualia
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              axis ſegmenta in­
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              tercipientibus, in
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              telligatur
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              ABC ſectum per
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              ea puncta planis
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              baſi cir
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              culo, vel ellipſi,
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              circa AC pa­
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              rallelis: quare ſe­
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              ctiones erunt cir­
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              culi, vel ellipſes ſimiles baſi, per definitionem, quarum dia­
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              metri eiuſdem rationis in eodem plano per axim ſint IK. </s>
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